Method for wireless communication, wireless station, mobile terminal, and wireless communication system

Abstract

There is a provided a wireless communication system in which multiple base station transmit the same data (PDSCH signal) in a coordinated transmission scheme. Each base station controls allocation a wireless resource that one of the remaining base station transmits a signal different from the above same data, such as a control signal or reference signal to a mobile station that is applied the coordinated transmission scheme to a mobile terminal that is different from the mobile station that is applied the coordinated transmission scheme and that is to communicate with the base station.

What is claimed is: 
     
       1. A wireless communication method for a communication system,
 the communication system comprising
 a first wireless base station, 
 a second wireless base station, 
 a first mobile terminal, and 
 a second mobile terminal; 
 
 the method comprising:
 performing, at the first wireless base station and the second wireless base station, a coordinated multi-point (CoMP) communication of first data with the first mobile terminal; 
 allocating, at the first wireless base station, a first wireless resource for a first transmission to the first mobile terminal; 
 transmitting, at the first wireless base station in the first transmission, a first signal from the first wireless base station to the first mobile terminal, the first signal being different from the first data; 
 allocating, at the second wireless base station, the first wireless resource for a second transmission to the second mobile terminal; 
 transmitting, at the second wireless base station in the second transmission, second data from the second wireless base station to the second mobile terminal, the second data being different from the first data; and 
 receiving, at the second mobile terminal, the second data in the second transmission, 
 
 wherein the method further comprises encoding, at the second wireless base station, the second data to suppress interference between the second data and the first signal. 
 
     
     
       2. The wireless communication method of  claim 1 , further comprising
 at the first mobile terminal, 
 notifying the second wireless base station of a first encoding scheme that reduces a first received power of data at the first mobile terminal from the second wireless base station, the first encoding scheme being a candidate encoding scheme used in the second transmission; 
 at each of a plurality of mobile terminals communicating with the second wireless base station, 
 notifying the second wireless base station of a second encoding scheme that increases a second received power of data at the mobile terminal, the second encoding scheme being a candidate encoding scheme used in the second transmission; and 
 at the second wireless base station, 
 selecting one of the plurality of mobile terminals that notifies the second encoding scheme identical to the first encoding scheme as the second mobile terminal. 
 
     
     
       3. The wireless communication method of  claim 1 , further comprising
 at the second wireless base station, 
 notifying the second mobile terminal of first control information regarding whether the second data destined for the second mobile terminal is allocated to the first wireless resource. 
 
     
     
       4. The wireless communication method of  claim 1 , further comprising
 at the second wireless base station, 
 notifying the second mobile terminal of second control information regarding an amount of the first wireless resource to be allocated to the first signal. 
 
     
     
       5. A first wireless base station comprising:
 a transmission unit that transmits first data to a first mobile terminal, the first data coordinately transmitted with a second wireless base station, the first wireless base station and the second wireless base station performing a coordinated multi-point (CoMP) communication for the first mobile terminal, and 
 an allocation controller that allocates to a second mobile terminal, a first wireless resource that the second wireless base station uses to transmit a first signal to the first mobile terminal, the first signal being different from the first data, the first data being coordinately transmitted during the CoMP; 
 wherein the second wireless base station is not the first wireless base station and the second mobile terminal is not the first mobile terminal, 
 wherein the transmission unit transmits second data to the second mobile terminal using the first wireless resource, 
 wherein the first wireless base station further comprises an encoder that encodes the second data to be transmitted to the second mobile terminal through the first wireless resource such that interference between the second data and the first signal is suppressed. 
 
     
     
       6. The first wireless base station of  claim 5 ,
 wherein the allocation controller obtains, from the first mobile terminal, a first encoding scheme that makes a received power of data that the first mobile terminal is to receive from the first wireless base station small, as a scheme of encoding data by the first wireless base station, 
 wherein the allocation controller obtains, from each of a plurality of mobile terminals communicating with the first wireless base station, a second encoding scheme that makes a received power of data that a respective mobile terminal is to receive from the first wireless base station large, as a scheme of encoding data by the first wireless base station, and 
 wherein the allocation controller selects one of the plurality of mobile terminals that notifies the second encoding scheme identical to the first encoding scheme as the second mobile terminal. 
 
     
     
       7. The first wireless base station according to  claim 5 , wherein the first wireless base station notifies the second mobile terminal of first control information regarding whether the second data destined for the second mobile terminal is allocated to the first wireless resource. 
     
     
       8. The first wireless base station according to  claim 5 , wherein the first wireless base station notifies the second mobile terminal of second control information regarding an amount of wireless resources to be allocated to the first signal. 
     
     
       9. A mobile terminal comprising:
 a receiver that receives first data from a first wireless base station and the first data from a second wireless base station, and that receives a first signal transmitted from the first wireless base station through a first wireless resource allocated to the mobile terminal, the first data being coordinately transmitted from the first wireless base station and the second wireless base station, the second wireless base station being different from the first wireless base station; and 
 a transmitter that notifies the second wireless base station of a data encoding scheme that makes a received power of second data received at the mobile terminal from the second wireless base station small, 
 wherein the data encoding scheme is adopted by the second wireless base station, and 
 wherein the second data being transmitted from the second wireless base station through the first wireless resource through which the mobile terminal receives the first signal from the first wireless base station, 
 wherein the first signal is different from the first data and the second data. 
 
     
     
       10. A wireless communication system comprising:
 a plurality of wireless base stations comprising a first wireless base station and a second wireless base station; and 
 a first mobile terminal and a second mobile terminal, wherein 
 the first wireless base station and the second wireless base station coordinately transmit first data to the first mobile terminal during a coordinated multi-point (CoMP) communication performed for the first mobile terminal; 
 the first mobile terminal comprises a receiver that receives the first data from the first wireless base station and the second wireless base station; 
 the first wireless base station comprises a first allocation controller that allocates a first wireless resource to the first mobile terminal, the first wireless resource being used to transmit a first signal from the first wireless base station to the first mobile terminal, the first signal being different from the first data, the first data being coordinately transmitted during the CoMP; and 
 the second wireless base station comprises a second allocation controller that allocates the first wireless resource to the second mobile terminal for communicating with the second wireless base station, 
 wherein the second wireless base station comprises an encoder, the encoder encoding second data to be transmitted to the second mobile terminal through the first wireless resource such that interference between the second data and the first signal is suppressed. 
 
     
     
       11. The wireless communication system according to  claim 10 , wherein the allocation controller of the second wireless base station
 obtains, from the first mobile terminal, a first encoding scheme that makes a received power of data that the first mobile terminal is to receive from the second wireless base station small, as a scheme of encoding data by the second wireless base station, 
 obtains, from each of a plurality of mobile terminals communicating with the second wireless base station, a second encoding scheme that makes a received power of data that the mobile terminal is to receive from the second wireless base station large, as a scheme of encoding data by the second wireless base station, and 
 selects one of the plurality of mobile terminals that notifies the second encoding scheme identical to the first encoding scheme as the second mobile terminal. 
 
     
     
       12. The wireless communication system according to  claim 10 , wherein the second wireless base station notifies the second mobile terminal of first control information regarding whether data destined for the second mobile terminal is allocated to the first wireless resource. 
     
     
       13. The wireless communication system according to  claim 10 , wherein the second wireless base station notifies the second mobile terminal of second control information regarding an amount of wireless resources to be allocated to the first signal. 
     
     
       14. A wireless communication method for a communication system,
 the communication system comprising
 a wireless base station including a first communication unit and a second communication unit, 
 a first mobile terminal, and 
 a second mobile terminal; 
 
 the method comprising:
 performing, at the first communication unit and the second communication unit, a coordinated multi-point (CoMP) communication of first data with the first mobile terminal, the first communication unit and the second communication unit respectively covering a first sector and a second sector of a plurality of cells formed by the wireless base station; 
 allocating, at the first communication unit, a first wireless resource for a first transmission to the first mobile terminal; 
 transmitting, at the first communication unit in the first transmission, a first signal from the first communication unit to the first mobile terminal, the first signal being different from the first data; 
 allocating, at the second communication unit, the first wireless resource for a second transmission to the second mobile terminal; 
 transmitting, at the second communication unit in the second transmission, second data from the second communication unit to the second mobile terminal, the second data being different from the first data; and 
 receiving, at the second mobile terminal, the second data in the second transmission, 
 
 wherein the method further comprises encoding, at the second communication unit, the second data to suppress interference between the second data and the first signal. 
 
     
     
       15. A wireless base station comprising:
 a first communication unit that covers a first sector of a plurality of cells formed by the wireless base station; and 
 a second communication unit covering a second sector of a plurality of cells formed by the wireless base station, 
 wherein the first communication unit and the second communication unit coordinately transmit first data to a first mobile terminal during a coordinated multi-point (CoMP) communication performed for the first mobile terminal; 
 wherein the first communication unit comprises a first allocation controller that allocates a first wireless resource to the first mobile terminal, the first wireless resource being used to transmit a first signal from the first communication unit to the first mobile terminal, the first signal being different from the first data, the first data being coordinately transmitted during the CoMP; and 
 wherein the second communication unit comprises a second allocation controller that allocates the first wireless resource to a second mobile terminal for communicating with the second communication unit, the second mobile terminal being different from the first mobile terminal, 
 wherein the second communication unit comprises an encoder that encodes second data to be transmitted to the second mobile terminal through the first wireless resource such that interference between the second data and the first signal is suppressed. 
 
     
     
       16. The wireless communication method of  claim 1 , wherein
 a wireless resource is allocated in units of a resource element, 
 the method further includes allocating, at the first wireless base station and the second wireless base station, one or more of first resource elements to the first mobile terminal for transmitting the first data, the first resource elements being allocatable in both of the first wireless base station and the second wireless base station, 
 the allocating of the first wireless resource to the first mobile terminal is performed by allocating, at the first wireless base station, one or more of second resource elements to the first mobile terminal for transmitting the first signal, 
 the allocating of the first wireless resource to the second mobile terminal is performed by allocating, at the second wireless base station, the second resource elements to the second mobile terminal for transmitting the second data, and 
 the receiving of the second data at the second mobile terminal is performed by receiving the second data transmitted using the second resource elements.